mirror of
https://github.com/schoebel/mars
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518 lines
12 KiB
C
518 lines
12 KiB
C
// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/bio.h>
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//#define BRICK_DEBUGGING
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//#define MARS_DEBUGGING
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//#define IO_DEBUGGING
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#include "lib_log.h"
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atomic_t global_mref_flying = ATOMIC_INIT(0);
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EXPORT_SYMBOL_GPL(global_mref_flying);
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void exit_logst(struct log_status *logst)
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{
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int count = 0;
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log_flush(logst);
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while (atomic_read(&logst->mref_flying) > 0) {
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if (!count++)
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MARS_DBG("waiting for IO terminating...");
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brick_msleep(500);
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}
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if (logst->read_mref) {
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MARS_DBG("putting read_mref\n");
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GENERIC_INPUT_CALL(logst->input, mref_put, logst->read_mref);
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logst->read_mref = NULL;
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}
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if (logst->log_mref) {
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MARS_DBG("putting log_mref\n");
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GENERIC_INPUT_CALL(logst->input, mref_put, logst->log_mref);
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logst->log_mref = NULL;
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}
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}
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EXPORT_SYMBOL_GPL(exit_logst);
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void init_logst(struct log_status *logst, struct mars_input *input, loff_t start_pos)
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{
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exit_logst(logst);
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memset(logst, 0, sizeof(struct log_status));
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logst->input = input;
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logst->brick = input->brick;
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logst->log_pos = start_pos;
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init_waitqueue_head(&logst->event);
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}
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EXPORT_SYMBOL_GPL(init_logst);
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#define MARS_LOG_CB_MAX 32
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struct log_cb_info {
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struct mref_object *mref;
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struct log_status *logst;
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struct semaphore mutex;
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atomic_t refcount;
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int nr_cb;
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void (*endios[MARS_LOG_CB_MAX])(void *private, int error);
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void *privates[MARS_LOG_CB_MAX];
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};
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static
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void put_log_cb_info(struct log_cb_info *cb_info)
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{
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if (atomic_dec_and_test(&cb_info->refcount)) {
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brick_mem_free(cb_info);
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}
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}
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static
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void _do_callbacks(struct log_cb_info *cb_info, int error)
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{
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int i;
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down(&cb_info->mutex);
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for (i = 0; i < cb_info->nr_cb; i++) {
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void (*end_fn)(void *private, int error);
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end_fn = cb_info->endios[i];
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cb_info->endios[i] = NULL;
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if (end_fn) {
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end_fn(cb_info->privates[i], error);
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}
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}
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up(&cb_info->mutex);
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}
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static
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void log_write_endio(struct generic_callback *cb)
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{
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struct log_cb_info *cb_info = cb->cb_private;
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struct log_status *logst;
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CHECK_PTR(cb_info, err);
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if (cb_info->mref) {
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mars_trace(cb_info->mref, "log_endio");
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mars_log_trace(cb_info->mref);
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}
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logst = cb_info->logst;
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CHECK_PTR(logst, done);
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MARS_IO("nr_cb = %d\n", cb_info->nr_cb);
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_do_callbacks(cb_info, cb->cb_error);
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done:
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put_log_cb_info(cb_info);
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atomic_dec(&logst->mref_flying);
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atomic_dec(&global_mref_flying);
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if (logst->signal_event)
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wake_up_interruptible(logst->signal_event);
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return;
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err:
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MARS_FAT("internal pointer corruption\n");
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}
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void log_flush(struct log_status *logst)
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{
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struct mref_object *mref = logst->log_mref;
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struct log_cb_info *cb_info;
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int align_size;
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int gap;
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if (!mref || !logst->count)
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return;
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gap = 0;
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align_size = (logst->align_size / PAGE_SIZE) * PAGE_SIZE;
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if (align_size > 0) {
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// round up to next alignment border
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int align_offset = logst->offset & (align_size-1);
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if (align_offset > 0) {
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int restlen = mref->ref_len - logst->offset;
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gap = align_size - align_offset;
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if (unlikely(gap > restlen)) {
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gap = restlen;
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}
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}
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}
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if (gap > 0) {
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// don't leak information from kernelspace
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memset(mref->ref_data + logst->offset, 0, gap);
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logst->offset += gap;
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}
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mref->ref_len = logst->offset;
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memcpy(&logst->log_pos_stamp, &logst->tmp_pos_stamp, sizeof(logst->log_pos_stamp));
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cb_info = logst->private;
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logst->private = NULL;
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SETUP_CALLBACK(mref, log_write_endio, cb_info);
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cb_info->logst = logst;
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mref->ref_rw = 1;
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mars_trace(mref, "log_flush");
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atomic_inc(&logst->mref_flying);
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atomic_inc(&global_mref_flying);
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GENERIC_INPUT_CALL(logst->input, mref_io, mref);
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GENERIC_INPUT_CALL(logst->input, mref_put, mref);
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logst->log_pos += logst->offset;
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logst->offset = 0;
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logst->count = 0;
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logst->log_mref = NULL;
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put_log_cb_info(cb_info);
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}
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EXPORT_SYMBOL_GPL(log_flush);
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void *log_reserve(struct log_status *logst, struct log_header *lh)
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{
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struct log_cb_info *cb_info = logst->private;
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struct mref_object *mref;
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void *data;
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short total_len = lh->l_len + OVERHEAD;
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int offset;
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int status;
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if (unlikely(lh->l_len <= 0 || lh->l_len > logst->max_size)) {
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MARS_ERR("trying to write %d bytes, max allowed = %d\n", lh->l_len, logst->max_size);
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goto err;
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}
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MARS_IO("reserving %d bytes at %lld\n", lh->l_len, logst->log_pos);
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mref = logst->log_mref;
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if ((mref && total_len > mref->ref_len - logst->offset)
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|| !cb_info || cb_info->nr_cb >= MARS_LOG_CB_MAX) {
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log_flush(logst);
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}
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mref = logst->log_mref;
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if (!mref) {
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if (unlikely(logst->private)) {
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MARS_ERR("oops\n");
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brick_mem_free(logst->private);
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}
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logst->private = brick_zmem_alloc(sizeof(struct log_cb_info));
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if (unlikely(!logst->private)) {
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MARS_ERR("no memory\n");
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goto err;
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}
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cb_info = logst->private;
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sema_init(&cb_info->mutex, 1);
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atomic_set(&cb_info->refcount, 2);
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mref = mars_alloc_mref(logst->brick);
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if (unlikely(!mref)) {
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MARS_ERR("no mref\n");
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goto err;
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}
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cb_info->mref = mref;
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mref->ref_pos = logst->log_pos;
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mref->ref_len = logst->chunk_size ? logst->chunk_size : total_len;
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mref->ref_may_write = WRITE;
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mref->ref_prio = logst->io_prio;
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for (;;) {
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status = GENERIC_INPUT_CALL(logst->input, mref_get, mref);
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if (likely(status >= 0)) {
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break;
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}
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if (status != -ENOMEM && status != -EAGAIN) {
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MARS_ERR("mref_get() failed, status = %d\n", status);
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goto err_free;
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}
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brick_msleep(100);
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}
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mars_trace(mref, "log_start");
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if (unlikely(mref->ref_len < total_len)) {
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MARS_ERR("ref_len = %d total_len = %d\n", mref->ref_len, total_len);
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goto put;
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}
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logst->offset = 0;
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logst->log_mref = mref;
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}
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offset = logst->offset;
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data = mref->ref_data;
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DATA_PUT(data, offset, START_MAGIC);
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DATA_PUT(data, offset, (char)FORMAT_VERSION);
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logst->validflag_offset = offset;
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DATA_PUT(data, offset, (char)0); // valid_flag
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DATA_PUT(data, offset, total_len); // start of next header
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DATA_PUT(data, offset, lh->l_stamp.tv_sec);
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DATA_PUT(data, offset, lh->l_stamp.tv_nsec);
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DATA_PUT(data, offset, lh->l_pos);
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logst->reallen_offset = offset;
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DATA_PUT(data, offset, lh->l_len);
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DATA_PUT(data, offset, (short)0); // spare
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DATA_PUT(data, offset, (int)0); // spare
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DATA_PUT(data, offset, lh->l_code);
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DATA_PUT(data, offset, (short)0); // spare
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// remember the last timestamp
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memcpy(&logst->tmp_pos_stamp, &lh->l_stamp, sizeof(logst->tmp_pos_stamp));
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logst->payload_offset = offset;
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logst->payload_len = lh->l_len;
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return data + offset;
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put:
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GENERIC_INPUT_CALL(logst->input, mref_put, mref);
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logst->log_mref = NULL;
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return NULL;
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err_free:
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mars_free_mref(mref);
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if (logst->private) {
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// TODO: if callbacks are already registered, call them here with some error code
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brick_mem_free(logst->private);
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logst->private = NULL;
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}
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err:
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return NULL;
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}
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EXPORT_SYMBOL_GPL(log_reserve);
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bool log_finalize(struct log_status *logst, int len, void (*endio)(void *private, int error), void *private)
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{
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struct mref_object *mref = logst->log_mref;
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struct log_cb_info *cb_info = logst->private;
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struct timespec now;
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void *data;
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int offset;
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int restlen;
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int nr_cb;
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int crc;
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bool ok = false;
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CHECK_PTR(mref, err);
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if (unlikely(len > logst->payload_len)) {
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MARS_ERR("trying to write more than reserved (%d > %d)\n", len, logst->payload_len);
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goto err;
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}
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restlen = mref->ref_len - logst->offset;
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if (unlikely(len + END_OVERHEAD > restlen)) {
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MARS_ERR("trying to write more than available (%d > %d)\n", len, (int)(restlen - END_OVERHEAD));
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goto err;
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}
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if (unlikely(!cb_info || cb_info->nr_cb >= MARS_LOG_CB_MAX)) {
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MARS_ERR("too many endio() calls\n");
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goto err;
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}
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data = mref->ref_data;
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crc = 0;
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if (logst->do_crc) {
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unsigned char checksum[mars_digest_size];
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mars_digest(checksum, data + logst->payload_offset, len);
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crc = *(int*)checksum;
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}
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/* Correct the length in the header.
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*/
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offset = logst->reallen_offset;
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DATA_PUT(data, offset, (short)len);
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/* Write the trailer.
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*/
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offset = logst->payload_offset + len;
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DATA_PUT(data, offset, END_MAGIC);
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DATA_PUT(data, offset, crc);
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DATA_PUT(data, offset, (char)1); // valid_flag copy
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DATA_PUT(data, offset, (char)0); // spare
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DATA_PUT(data, offset, (short)0); // spare
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DATA_PUT(data, offset, logst->seq_nr + 1);
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get_lamport(&now); // when the log entry was ready.
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DATA_PUT(data, offset, now.tv_sec);
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DATA_PUT(data, offset, now.tv_nsec);
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if (unlikely(offset > mref->ref_len)) {
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MARS_FAT("length calculation was wrong: %d > %d\n", offset, mref->ref_len);
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goto err;
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}
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logst->offset = offset;
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/* This must come last. In case of incomplete
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* or even overlapping disk transfers, this indicates
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* the completeness / integrity of the payload at
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* the time of starting the transfer.
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*/
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offset = logst->validflag_offset;
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DATA_PUT(data, offset, (char)1);
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nr_cb = cb_info->nr_cb++;
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cb_info->endios[nr_cb] = endio;
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cb_info->privates[nr_cb] = private;
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// report success
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logst->seq_nr++;
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logst->count++;
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ok = true;
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err:
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return ok;
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}
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EXPORT_SYMBOL_GPL(log_finalize);
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static
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void log_read_endio(struct generic_callback *cb)
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{
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struct log_status *logst = cb->cb_private;
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CHECK_PTR(logst, err);
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logst->error_code = cb->cb_error;
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logst->got = true;
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wake_up_interruptible(&logst->event);
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return;
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err:
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MARS_FAT("internal pointer corruption\n");
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}
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int log_read(struct log_status *logst, bool sloppy, struct log_header *lh, void **payload, int *payload_len)
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{
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struct mref_object *mref;
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int old_offset;
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int status;
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restart:
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status = 0;
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mref = logst->read_mref;
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if (!mref || logst->do_free) {
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if (mref) {
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GENERIC_INPUT_CALL(logst->input, mref_put, mref);
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logst->read_mref = NULL;
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logst->log_pos += logst->offset;
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logst->offset = 0;
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}
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mref = mars_alloc_mref(logst->brick);
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if (unlikely(!mref)) {
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MARS_ERR("no mref\n");
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goto done;
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}
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mref->ref_pos = logst->log_pos;
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mref->ref_len = logst->chunk_size;
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mref->ref_prio = logst->io_prio;
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status = GENERIC_INPUT_CALL(logst->input, mref_get, mref);
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if (unlikely(status < 0)) {
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if (status != -ENODATA) {
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MARS_ERR("mref_get() failed, status = %d\n", status);
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}
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goto done_free;
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}
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if (unlikely(mref->ref_len <= OVERHEAD)) { // EOF
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status = 0;
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goto done_put;
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}
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SETUP_CALLBACK(mref, log_read_endio, logst);
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mref->ref_rw = READ;
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logst->offset = 0;
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logst->got = false;
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logst->do_free = false;
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GENERIC_INPUT_CALL(logst->input, mref_io, mref);
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wait_event_interruptible_timeout(logst->event, logst->got, 60 * HZ);
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status = -EIO;
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if (!logst->got)
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goto done_put;
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status = logst->error_code;
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if (status < 0)
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goto done_put;
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logst->read_mref = mref;
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}
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status = log_scan(mref->ref_data + logst->offset,
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mref->ref_len - logst->offset,
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mref->ref_pos,
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logst->offset,
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sloppy,
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lh,
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payload,
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payload_len,
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&logst->seq_nr);
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if (unlikely(status == 0)) {
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MARS_ERR("bad logfile scan\n");
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status = -EINVAL;
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}
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if (unlikely(status < 0)) {
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goto done_put;
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}
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// memoize success
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logst->offset += status;
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if (logst->offset + (logst->max_size + OVERHEAD) * 2 >= mref->ref_len) {
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logst->do_free = true;
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}
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done:
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if (status == -ENODATA) {
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status = 0; // indicates EOF
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}
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return status;
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done_put:
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old_offset = logst->offset;
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if (mref) {
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GENERIC_INPUT_CALL(logst->input, mref_put, mref);
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logst->read_mref = NULL;
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logst->log_pos += logst->offset;
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logst->offset = 0;
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}
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if (status == -EAGAIN && old_offset > 0) {
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goto restart;
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}
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goto done;
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done_free:
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if (mref) {
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mars_free_mref(mref);
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}
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logst->read_mref = NULL;
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goto done;
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}
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EXPORT_SYMBOL_GPL(log_read);
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////////////////// module init stuff /////////////////////////
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int __init init_log_format(void)
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{
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MARS_INF("init_log_format()\n");
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return 0;
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}
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void __exit exit_log_format(void)
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{
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MARS_INF("exit_log_format()\n");
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}
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#ifndef CONFIG_MARS_HAVE_BIGMODULE
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MODULE_DESCRIPTION("MARS log_format infrastucture");
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MODULE_AUTHOR("Thomas Schoebel-Theuer <tst@1und1.de>");
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MODULE_LICENSE("GPL");
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module_init(init_log_format);
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module_exit(exit_log_format);
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#endif
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